QGIS API Documentation  2.15.0-Master (02a0ebe)
priorityqueue.h
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1 /*
2  * libpal - Automated Placement of Labels Library
3  *
4  * Copyright (C) 2008 Maxence Laurent, MIS-TIC, HEIG-VD
5  * University of Applied Sciences, Western Switzerland
6  * http://www.hes-so.ch
7  *
8  * Contact:
9  * maxence.laurent <at> heig-vd <dot> ch
10  * or
11  * eric.taillard <at> heig-vd <dot> ch
12  *
13  * This file is part of libpal.
14  *
15  * libpal is free software: you can redistribute it and/or modify
16  * it under the terms of the GNU General Public License as published by
17  * the Free Software Foundation, either version 3 of the License, or
18  * (at your option) any later version.
19  *
20  * libpal is distributed in the hope that it will be useful,
21  * but WITHOUT ANY WARRANTY; without even the implied warranty of
22  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
23  * GNU General Public License for more details.
24  *
25  * You should have received a copy of the GNU General Public License
26  * along with libpal. If not, see <http://www.gnu.org/licenses/>.
27  *
28  */
29 
30 #ifndef PAL_PRIORITYQUEUE_H
31 #define PAL_PRIORITYQUEUE_H
32 
33 #include <iostream>
34 
35 #define LEFT(x) (2*x+1)
36 #define RIGHT(x) (2*x+2)
37 #define PARENT(x) ((x-1)/2)
38 
39 
40 namespace pal
41 {
47  {
48 
49  public:
55  PriorityQueue( int n, int maxId, bool min );
57 
58  void print();
59 
60  int getSize();
61  int getSizeByPos();
62 
63  bool isIn( int key );
64 
65  int getBest(); // O(log n)
66 
67  void remove( int key );
68  void insert( int key, double p );
69 
70  void sort(); // O(n log n)
71 
72  void downheap( int id );
73  void upheap( int key );
74 
75  void decreaseKey( int key );
76  void setPriority( int key, double new_p );
77 
78 
79  int getId( int key );
80  private:
81  PriorityQueue( const PriorityQueue & );
82  PriorityQueue &operator=( const PriorityQueue & );
83 
84  int size;
85  int maxsize;
86  int maxId;
87  int *heap;
88  double *p;
89  int *pos;
90 
91  bool ( *greater )( double l, double r );
92  };
93 
94 } // namespace
95 
96 #endif
bool isIn(int key)
void upheap(int key)
void downheap(int id)
void insert(int key, double p)
void setPriority(int key, double new_p)
PriorityQueue(int n, int maxId, bool min)
Create a priority queue of max size n @param n max size of the queuet @param p external vector repres...
double ANALYSIS_EXPORT min(double x, double y)
Returns the minimum of two doubles or the first argument if both are equal.
void decreaseKey(int key)